Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DONNELL
As described in historical dictionaries
Patronymica Britannica (1860)
MAC DONNELL. Descended from Donald, Lord of the Isles, a common ancestor of the Earl of Antrim. This branch has been settled in co. Clare for more than two centuries.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic